若实数xy满足(x²+y²+1)(x²+y²+3)=0则x²+y
已知实数x,y满足x²+y²-xy+2x-y+1=0 求x y
若实数x,y满足x²+y²+xy=1,则x+y的最大值
若实数xy满足(x²+y²+1)(x²+y²+3)=0则x²+y
若实数x,y满足x根号(1-x)=根号(y-2)+根号(x-1),求3x²+xy-y²/x²
已知实数xy,满足10x²-2xy+y²+6x+1=0,求x+y
已知实数xy满足x²﹢y²-xy+2x-y+1=0求xy
已知实数x,y满足5x²+2y²+1=6xy+4x-2y,则x²-xy+2000y
实数xy满足2x²+2x+y-1=0则x+y的最大值
实数x y满足x≥y≥1和2x²-xy-5x+y+4=0求x+y之值
已知xy都是正实数且满足4x²+4xy+y²+2x+y-6=0则x(1-y)的最小值
已知实数x,y,z满足:x+y-6=0,z²+9=xy,则x²+1/3y²=?
已知实数x,y满足条件|2x+3y+1|+(x+3y+5)²=0,求式子(-2xy)²×(-y